[mlpack-git] [mlpack] Warn if ratings of 0 are found (#376)

[Stephen Tu]

Some food for thought: numpy has these things called "masked arrays" (http://docs.scipy.org/doc/numpy/reference/maskedarray.html). While the actual implementation in numpy is pretty buggy, I think the idea has merit. I think the masked array is really the abstraction we're looking for here. 

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